File:Masters of space- Morse and the telegraph; Thompson and the cable; Bell and the telephone; Marconi and the wireless telegraph; Carty and the wireless telephone; (1917) (14569642007).jpg

Identifier: mastersofspacemo00towe (find matches)
Title: Masters of space: Morse and the telegraph; Thompson and the cable; Bell and the telephone; Marconi and the wireless telegraph; Carty and the wireless telephone;
Year: 1917 (1910s)
Authors: Towers, Walter Kellogg, 1888-
Subjects: Morse, Samuel Finley Breese, 1791-1872 Kelvin, William Thomson, Baron, 1824-1907 Bell, Alexander Graham, 1847-1922 Marconi, Guglielmo, marchese, 1874-1937 Carty, John J. (John Joseph), 1861-1932 Telegraph Telegraph, Wireless Telephone Radio
Publisher: New York, London, Harper & brothers
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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lished. Almost the first news that came over the wire was that ofthe signing of the treaty of peace which endedthe war between Prussia and Austria. Early in August the Great Eastern againsteamed away to search for the cable brokenthe year before. Arriving on the spot, the grapples were thrown out and the tedious work of dragging the sea-bottom was begun.After many efforts the cable was finally secured and raised to the surface. A new section was spliced on and the ship again turned toward America. On September 7th the second cable was successfully landed,and two wires were now in operation between the continents. Thus was the great taskdoubly fulfilled. Once again there were public celebrations in England and America.Field received the deserved plaudits of his countrymen and Thomson was knighted in recognition of his achievements. The new cables proved a success and werekept in operation for many years. Thom-son^ mirror receiver had been improved until it displayed remarkable sensitiveness. 136
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IMAGE: The Great Eastern laying the Atlantic cable, 1886.A SUCCESSFUL CABLE ATTAINED Using the current from a battery placed in a ladys thimble, a message was sent across the Atlantic through one cable and back through the other. Professor Thomson wasto give to submarine telegraphy an even more remarkable instrument. The mirror instrument did not give a permanent record of themessages. The problem of devising a means of recording the messages delicate enough so that it could be operated with rapidity bythe faint currents coming over a long cable was extremely difficult. But Thomson solvedit with his siphon recorder. In this a small coil is suspended between the poles of a large magnet, the coil being free to turn upon its axis. When the current from the cablepasses through the coil it moves, and so varies the position of the ink-siphon which is attached to it. The friction of a pen on paper would have proved too great a drag on sodelicate an instrument, and so a tiny jet ofink from the siphon was substituted. The ink is made to pass through the siphon w

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